CN103368524A - Signal conditioning circuit for remote monitoring system of distribution transformer - Google Patents
Signal conditioning circuit for remote monitoring system of distribution transformer Download PDFInfo
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- CN103368524A CN103368524A CN2013102373223A CN201310237322A CN103368524A CN 103368524 A CN103368524 A CN 103368524A CN 2013102373223 A CN2013102373223 A CN 2013102373223A CN 201310237322 A CN201310237322 A CN 201310237322A CN 103368524 A CN103368524 A CN 103368524A
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Abstract
The invention discloses a signal conditioning circuit for a remote monitoring system of a distribution transformer. The signal conditioning circuit comprises an acquired signal input line (1), a first resistor (R1), a second resistor (R2), a first capacitor (C1), a follow-up amplifying circuit and a conditioning signal output line (2), wherein the two ends of the second resistor (R2) are connected with the acquired signal input line (1) and the input end of the follow-up amplifying circuit respectively; the conditioning signal output line (2) is connected with the output end of the follow-up amplifying circuit; one end of the first resistor (R1) is connected to the acquired signal input line (1), and the other end of the first resistor (R1) is grounded; and one end of the first capacitor (C1) is connected to a circuit between the second resistor (R2) and the input end of the follow-up amplifying circuit, and the other end of the first capacitor (C1) is grounded. Due to the adoption of the signal conditioning circuit, high-frequency signals in acquired signals can be filtered, spectrum aliasing and high-frequency interference of signals can be prevented, and correct judgment of a controller of the monitoring system is prevented from being influenced by high-frequency signals.
Description
Technical field
The present invention relates to the auxiliary system of distribution transformer, specifically be used for the signal conditioning circuit of distribution transformer long distance control system.
Background technology
Along with industrial expansion, all trades and professions improve day by day to the power supply reliability of electric power system and the requirement of stability, distribution transformer is as the core link of electric power system, and it is the power equipment of electric energy directly being distributed to low-voltage customer, and its service data is the basic data of whole power distribution network.Therefore, the safe operation of distribution transformer is most important to electric power system.For distribution transformer is monitored, existing distribution power transformation device generally is equipped with the supervisory control system based on radio communication, and supervisory control system is usually come analyzing and processing by the current signal that gathers distribution transformer, and then realizes the remote monitoring to distribution power transformation device.Usually be accompanied by high-frequency signal in the signal that supervisory control system collects, be prone to spectral aliasing and High-frequency Interference, and then the controller that can affect distribution power transformation device supervisory control system is made correct control.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of energy filtering collection signal medium-high frequency signal is provided, and then can avoid occurring the signal conditioning circuit that is used for the distribution transformer long distance control system of spectral aliasing and High-frequency Interference.
Purpose of the present invention is achieved through the following technical solutions: the signal conditioning circuit that is used for the distribution transformer long distance control system, comprise collection signal input line, the first resistance, the second resistance, the first electric capacity, follow amplifying circuit and conditioned signal output line, described the second resistance two ends respectively with the collection signal input line be connected input amplifier and be connected, described conditioned signal output line is connected with the output of following amplifying circuit, described the first resistance one end is connected on the collection signal input line its other end ground connection; Described the first electric capacity one end is connected to the second resistance and follows on the circuit between the input amplifier its other end ground connection.When the present invention used, the current signal that collects from the output of conditioned signal output line, wherein, was followed amplifying circuit and is had the high impedance matching properties after the present invention processes through collection signal input line input, can reduce signal and carry out the loss of postorder when processing.
Be used for the signal conditioning circuit of distribution transformer long distance control system, also comprise the transient voltage twin zener dioder, described transient voltage twin zener dioder one end is connected on the collection signal input line, its other end ground connection.Wherein, the transient voltage twin zener dioder can suppress the glitch of voltage or electric current, prevent the unexpected rising of voltage and current, when the transient voltage twin zener dioder stands high energy impact events, it can make with high speed its impedance suddenly reduce, absorb simultaneously a large electric current, with the voltage clamp between its two ends on a predetermined numerical value, thereby the circuit element of guaranteeing the back is subjected to the high-octane impact of transient state and damages.
As preferably, described follow circuit is made of the first operational amplifier, and described the second resistance is connected with the in-phase input end of the first operational amplifier, and the inverting input of described the first operational amplifier is connected with its output.
The first operational amplifier of the present invention both can adopt common source with other element in the supervisory control system, also can adopt independent current source, and for the ease of independent control power supply, as preferably, described the first operational amplifier is connected with power supply.
Compared with prior art, the present invention has following beneficial effect: the present invention includes the first resistance, the second resistance, the first electric capacity and follow amplifying circuit, the present invention uses element few, be convenient to realize, cost is low, collection signal was inputted the low-pass filter circuit of the second resistance and the first electric capacity formation when the present invention used behind the first electric resistance partial pressure, under the effect of filter circuit, energy filtering high-frequency signal, so, can avoid occurring spectral aliasing and High-frequency Interference, and then the controller that can avoid high-frequency signal to affect distribution power transformation device supervisory control system is made correct control.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
The corresponding name of Reference numeral is called in the accompanying drawing: 1, collection signal input line, 2, the conditioned signal output line, R1, the first resistance, R2, the second resistance, C1, the first electric capacity, D1, transient voltage twin zener dioder, A1, the first operational amplifier, VCC, power supply.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the signal conditioning circuit that is used for the distribution transformer long distance control system, comprise collection signal input line 1, the first resistance R 1, the second resistance R 2, the first capacitor C 1, follow amplifying circuit and conditioned signal output line 2, wherein, following amplifying circuit preferably adopts the first operational amplifier A 1 to realize, the inverting input of the first operational amplifier A 1 is connected with its output, and the first operational amplifier A 1 is connected with power supply VCC and is provided with ground path.The second resistance R 2 two ends respectively with collection signal input line 1 be connected operational amplifier A 1 in-phase input end and be connected, conditioned signal output line 2 is connected with the first operational amplifier A 1 output.The first resistance R 1 one ends are connected on the collection signal input line 1, its other end ground connection; The first capacitor C 1 one ends are connected on the circuit between the second resistance R 2 and the first operational amplifier A 1 in-phase input end, its other end ground connection.
Present embodiment also comprises transient voltage twin zener dioder D1, and wherein, transient voltage twin zener dioder D1 one end is connected on the collection signal input line 1, its other end ground connection.In the present embodiment the first resistance R 1 be connected to node select on the collection signal input line 1 at transient voltage twin zener dioder D1 between the node on the collection signal input line 1 and the second resistance R 2.
When present embodiment is used, the current signal that gathers is from 1 input of collection signal input line, and through the first resistance R 1 dividing potential drop, convert voltage signal in the signal input point, behind the low-pass filter circuit filtering high-frequency signal of the second resistance R 2 and the first capacitor C 1 formation, after processing, the first operational amplifier A 1 exports from conditioned signal output line 2 again.
Above content is in conjunction with the further description of concrete preferred implementation to the present invention's work, can not assert that the specific embodiment of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, not breaking away from other execution modes that draw under the technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (4)
1. the signal conditioning circuit that is used for the distribution transformer long distance control system, it is characterized in that: comprise collection signal input line (1), the first resistance (R1), the second resistance (R2), the first electric capacity (C1), follow amplifying circuit and conditioned signal output line (2), described the second resistance (R2) two ends respectively with collection signal input line (1) be connected input amplifier and be connected, described conditioned signal output line (2) is connected with the output of following amplifying circuit, described the first resistance (R1) end is connected on the collection signal input line (1), its other end ground connection; Described the first electric capacity (C1) end is connected to the second resistance (R2) and follows on the circuit between the input amplifier its other end ground connection.
2. the signal conditioning circuit for the distribution transformer long distance control system according to claim 1, it is characterized in that: also comprise transient voltage twin zener dioder (D1), described transient voltage twin zener dioder (D1) end is connected on the collection signal input line (1), its other end ground connection.
3. the signal conditioning circuit for the distribution transformer long distance control system according to claim 1 and 2, it is characterized in that: described follow circuit is made of the first operational amplifier (A1), described the second resistance (R2) is connected with the in-phase input end of the first operational amplifier (A1), and the inverting input of described the first operational amplifier (A1) is connected with its output.
4. the signal conditioning circuit for the distribution transformer long distance control system according to claim 3, it is characterized in that: described the first operational amplifier (A1) is connected with power supply (VCC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102373223A CN103368524A (en) | 2013-06-17 | 2013-06-17 | Signal conditioning circuit for remote monitoring system of distribution transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102373223A CN103368524A (en) | 2013-06-17 | 2013-06-17 | Signal conditioning circuit for remote monitoring system of distribution transformer |
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| CN103368524A true CN103368524A (en) | 2013-10-23 |
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| CN2013102373223A Pending CN103368524A (en) | 2013-06-17 | 2013-06-17 | Signal conditioning circuit for remote monitoring system of distribution transformer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684325A (en) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | Filter circuit efficient in filtering |
| CN104503525A (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | Voltage attenuation conditioning circuit insusceptible to interference |
| CN106100607A (en) * | 2016-08-04 | 2016-11-09 | 三河市汇莹电气设备制造有限公司 | A kind of passive filter |
| CN107733469A (en) * | 2017-11-17 | 2018-02-23 | 联桥科技有限公司 | A kind of power wire broadband carrier communication anti-jamming circuit |
| CN108574474A (en) * | 2018-07-12 | 2018-09-25 | 鲁东大学 | A circuit for correcting the influence of pulse signal on instrument detection |
| CN109412542A (en) * | 2018-12-10 | 2019-03-01 | 中国航发南方工业有限公司 | Pressure signal conditioning circuit and electronic controller |
| CN113359022A (en) * | 2021-07-01 | 2021-09-07 | 深圳群芯微电子有限责任公司 | Measuring method, circuit and device for screening optical MOS relay |
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| CN202780179U (en) * | 2012-10-11 | 2013-03-13 | 淄博山大奥太电气有限公司 | Overcurrent protection circuit of main circuit of inverter welding machine |
| CN203278402U (en) * | 2013-06-17 | 2013-11-06 | 成都荣耀科技有限公司 | Signal conditioner of distribution transformer remote monitoring system based on wireless communication |
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| CN1677298A (en) * | 2005-03-21 | 2005-10-05 | 杨建宁 | Heating air-conditioner fan and integrated self-control device for water pump |
| CN2864697Y (en) * | 2005-12-30 | 2007-01-31 | 保定天威集团有限公司 | Voltage isolation sampling device |
| CN102215027A (en) * | 2010-04-12 | 2011-10-12 | 上海锐帕节能科技有限公司 | Cascade speed control device |
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| CN202780179U (en) * | 2012-10-11 | 2013-03-13 | 淄博山大奥太电气有限公司 | Overcurrent protection circuit of main circuit of inverter welding machine |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684325A (en) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | Filter circuit efficient in filtering |
| CN104503525A (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | Voltage attenuation conditioning circuit insusceptible to interference |
| CN106100607A (en) * | 2016-08-04 | 2016-11-09 | 三河市汇莹电气设备制造有限公司 | A kind of passive filter |
| CN107733469A (en) * | 2017-11-17 | 2018-02-23 | 联桥科技有限公司 | A kind of power wire broadband carrier communication anti-jamming circuit |
| CN107733469B (en) * | 2017-11-17 | 2023-10-20 | 联桥科技有限公司 | Anti-interference circuit for power line broadband carrier communication |
| CN108574474A (en) * | 2018-07-12 | 2018-09-25 | 鲁东大学 | A circuit for correcting the influence of pulse signal on instrument detection |
| CN108574474B (en) * | 2018-07-12 | 2023-08-08 | 鲁东大学 | A circuit for correcting the influence of pulse signal on instrument detection |
| CN109412542A (en) * | 2018-12-10 | 2019-03-01 | 中国航发南方工业有限公司 | Pressure signal conditioning circuit and electronic controller |
| CN109412542B (en) * | 2018-12-10 | 2022-11-04 | 中国航发南方工业有限公司 | Pressure signal conditioning circuit and electronic controller |
| CN113359022A (en) * | 2021-07-01 | 2021-09-07 | 深圳群芯微电子有限责任公司 | Measuring method, circuit and device for screening optical MOS relay |
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Application publication date: 20131023 |